Amasa galeoderma, Smith & Beaver & Cognato, 2020

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Amasa galeoderma sp. nov. Fig. 8E, F, K

Type material.

Holotype, female, Vietnam: Dong Nai, Cat Tien N.P., 11.44221, 107.43114, 379 m, 20.ii.2017, VN79, A.I. Cognato, T.A. Hoang, ex 4 cm diameter branch (MSUC). Paratypes, female, as holotype (NHMW, 1; NHMUK, 1; NMNH, 1; VMNH, 1).

Diagnosis.

3.0 mm long (mean = 3.0 mm; n = 5); 2.5 × as long as wide. This species is distinguished by the pronotum appearing basic (type 2) when viewed dorsally, anterior margin serrate; declivital surface shagreened, dull, opaque; declivital interstriae granulate, granules multiseriate, confused; declivital interstriae 1 moderately covered with semi-recumbent fine hair-like setae, less than 1/2 width of an interstria; and circumdeclivital carina margin setose, setae short, erect, hair-like.

Similar species.

Amasa cycloxyster , A. resecta , A. schlichii , A. versicolor .

Description

(female). 3.0 mm long (mean = 3.0 mm; n = 5); 2.5 × as long as wide. Body bicolored: pronotum, head, legs and antennae orange, elytra and abdomen dark brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; median impression between eyes; surface shagreened, impunctate, alutaceous, asperate; asperities longitudinal, smaller, rounder, denser above epistoma, increasing in size and length and decreasing in density dorsally and laterally. Eyes very deeply emarginate just above antennal insertion, upper part smaller than lower part. Submentum triangular, deeply impressed. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 4; segment corneous, 1 convex on anterior face, occupying approximately basal 1/4; segment 2 narrow, larger than segment 1, corneous; segments 1-3 present on posterior face. Pronotum: 1.0 × as long as wide. In dorsal view basic and parallel-sided, type 2, sides parallel in basal 1/2, rounded anteriorly; anterior margin with a row of 5-7 serrations. In lateral view basic, type 0, disc flat, summit at midpoint. Anterior slope strongly shiny, with widely spaced, moderate asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, semi-recumbent, hair-like setae. Disc shiny, alutaceous, sparsely finely punctate, glabrous. Lateral margins obliquely costate. Base transverse, posterior angles narrowly rounded. Elytra: 1.35 × as long as wide, 1.25 × as long as pronotum. Scutellum moderately sized, broad, linguiform, flush with elytra, flat, shiny. Elytral base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 3/4, then sharply angulate to apex. Disc ascending posteriorly, shiny, glabrous; striae and interstriae laterally diverging from base to declivital summit; striae not impressed, punctures separated by 2-3 diameters of a puncture; interstriae flat, finely uniseriate punctate, punctures 1/3 size of strial punctures. Declivity truncate, face flattened, strongly shagreened, dull, glabrous; three striae present, striae moderately impressed, striae 2 equidistant between striae 1 and 3, strial punctures shiny, very large, shallow, much larger than on disc, punctures subcontiguous; interstriae impunctate, convex, interstriae 1 more strongly convex, interstriae 1-3 multiseriate granulate, granules multiseriate, confused, interstriae 1 moderately covered with fine, semi-recumbent, hair-like setae, less than 1/2 width of an interstria. Posterolateral margin forming a circumdeclivital carina; carina setose, setae short, erect, hair-like. Legs: procoxae contiguous, prosternal coxal piece flat, inconspicuous. Protibiae slender, broadest at apical 1/3; posterior face inflated, finely granulate; apical 1/2 of outer margin with six small socketed denticles, their length as long as basal width. Meso- and metatibiae broad, flattened, outer margins evenly rounded with nine and 11 small socketed denticles, respectively, posterior faces unarmed; anterior faces finely granulate.

Etymology.

G. galeos = shark; derma = skin. In reference to the shagreened face of the declivity. Noun in apposition.

Distribution.

Vietnam.

Host plants.

Unknown.

Figures

Figure 8. Dorsal, lateral and declivital view of Amasa cylindrotomica, 2.1 - 2.4 mm (A, B, I), A. eugeniae paratype, 2.8 - 3.2 mm (C, D, J), A. galeoderma holotype, 3.0 mm (E, F, K), and A. gibbosa holotype, 3.5 - 3.6 mm (G, H, L).